EP1116936A1 - Detecteur de position - Google Patents

Detecteur de position Download PDF

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Publication number
EP1116936A1
EP1116936A1 EP98941684A EP98941684A EP1116936A1 EP 1116936 A1 EP1116936 A1 EP 1116936A1 EP 98941684 A EP98941684 A EP 98941684A EP 98941684 A EP98941684 A EP 98941684A EP 1116936 A1 EP1116936 A1 EP 1116936A1
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EP
European Patent Office
Prior art keywords
position data
time
output
request signal
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP98941684A
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German (de)
English (en)
Other versions
EP1116936A4 (fr
Inventor
Takashi Mitsubishi Denki K.K. OKAMURO
Hirokazu Mitsubishi Denki K.K. SAKUMA
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1116936A1 publication Critical patent/EP1116936A1/fr
Publication of EP1116936A4 publication Critical patent/EP1116936A4/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains

Definitions

  • the present invention relates to a position detection apparatus. More specifically, this invention relates to a position detection apparatus in which data representing a position of an object to be measured is calculated from an output of a sensor for detecting a position of the object.
  • position detection apparatus there are some apparatuses in which data representing a position of an object to be measured is calculated from an output of a sensor, that is, some (not negligible) time is required for obtaining position data from the output of the sensor.
  • Fig. 10 shows one example of such a conventional position detection apparatus.
  • This position detection apparatus 110 is a so-called optical rotary encoder, which is a type connected to a motor controller 132 by a serial transmission line 131.
  • the position detection apparatus 110 comprises a light-emitting circuit 111, a photo-detecting circuit 112, a scale disc 113 and an amplifier 114.
  • the position detection apparatus 110 also comprises a sample holding section 115, a multiplexer 116, an A/D converter 117, a microcomputer 118, a serial signal conversion circuit 119, and a serial signal transmission circuit 120.
  • the light-emitting circuit 111 is a circuit including light emission elements 121, M in number (M is a plural number).
  • the photo-detecting circuit 112 is a circuit including photodetectors 122, M in number, which convert light from the light emission elements 121 in the light-emitting circuit 111 to electric signals (analog signals), respectively.
  • the scale disc 113 (also referred to as a slit disc or a code-disc) is turntable machined so that the intensity of light incident on the photodetectors 122 in the photo-detecting circuit 112 changes, and by means of the rotation of this scale disc 113, M sine-wave signals or triangular wave signals having different periods or phases are output from the M photodetectors 122 in the photo-detecting circuit 112.
  • Sine-wave signals can be output when a scale disc 133 with a sine-wave slit is used. However, sine-wave signals can be output even when a rectangular slit is used. Because, when a rectangular slit is used, a substantially sine-wave signal (pseudo sine-wave signal) can be obtained due to the diffraction effect of the light.
  • the scale disc 133 is generally attached to a rotation shaft of a motor which is controlled by the motor controller 132.
  • the amplifier 114 is a circuit for amplifying the output of each photodetector 122 in the photo-detecting circuit 112. That is to say, the amplifier 114 is a circuit for outputting M analog signals.
  • the sample holding section 115 includes M sample holding circuits respectively connected to M amplifying circuits in the amplifier 114. All the sample holding circuits in the sample holding section 115 are supplied with the sample holding signals from the microcomputer 118. That is to say, the sample holding section 115 simultaneously holds M signals which change time-wise, output from the amplifying circuit 114, when a sample holding signal instructing the holding operation is input, and subsequently continues to output the held M signals.
  • the multiplexer 116 outputs a signal instructed by the microcomputer 118, among M signals output from the sample holding section 115.
  • the A/D converter 117 converts the analog signal output from the multiplexer 116 to a digital signal, and the control of the operation timing of the A/D converter 117 is also performed by the microcomputer 118.
  • the serial signal conversion circuit 119 converts a parallel signal from the microcomputer 118 to a serial signal, and supplies the serial signal to the serial signal transmission circuit 120.
  • the serial signal conversion circuit 119 also performs a processing which is reverse to this.
  • the serial signal conversion circuit 119 outputs a signal for informing the microcomputer 118 of this matter.
  • the serial signal transmission circuit 120 is an interface circuit with the motor controller 132.
  • the serial signal transmission circuit 120 prepares a transmission signal by subjecting the serial signal provided by the serial signal conversion circuit 19 to a predetermined processing (calculation of CRC, addition of start bit and stop bit, or the like), and supplies the prepared transmission signal to the motor controller 132 via the serial transmission line 131.
  • the serial signal transmission circuit 120 also performs a processing for preparing a serial signal corresponding to the transmission signal received from the motor controller 132.
  • the microcomputer 118 is a control circuit of the position detection apparatus 110.
  • the microcomputer 118 includes an input circuit 123, an output circuit 124, a CPU 125 and a timer 126, and the output of the A/D converter 117 is supplied to the CPU 125 via the input circuit 124.
  • the sample holding signal is output from the output circuit 125 under the control of the CPU 125.
  • the serial signal conversion circuit 119 is connected to the CPU 125.
  • the position detection apparatus 110 is provided with a circuit for detecting that the scale disc 113 has made one revolution from the output of a specific photodetector 122 in the photo-detecting circuit 112, and a multi-turn counter for counting how many revolutions the scale disc 113 has made based on the detection result of the circuit, and the multi-turn counter is also connected to the CPU 125.
  • FIG. 11 illustrates a timing for the position detection apparatus 110 to receive a request signal from the motor controller 132
  • (B) illustrates the time change in a value of a timer 126 in the microcomputer 118
  • (C) illustrates the time change in the sample holding signal output from the microcomputer 118 to the sample holding section 115
  • (D) illustrates the time change in the contents of processing executed by the CPU 125.
  • (E) illustrates the timing when a position signal is transmitted from the position detection apparatus 110.
  • the position detection apparatus 110 is an apparatus which supplies a position signal holding position data representing the position of the scale disc 113 at the time when it receives a request signal from the motor controller 132 via the serial transmission line 131, as a response to the request signal, via the serial transmission line 131 to the motor controller 132.
  • the position data handed over to the motor controller 132 comprises 2-byte data showing how many turns the scale disc 113 has made until then, and 2-byte data related to the angle of rotation of the scale disc 113.
  • the former data is obtained from the multi-turn counter, and hence required data related to the time can be obtained immediately.
  • the data related to the angle of rotation is calculated by numerical operation based on the output of the photo-detecting section 112, and hence, relatively long period of time is required for the completion of processing to obtain the data. Accordingly, if it is so constructed that the processing is to be started at the time of reception of the request signal, the position data representing the position of the slit disc 113 at the time when the request signal is transmitted is received, after a while after the transmission of the request signal.
  • the position data representing the position of the scale disc 113 can be obtained at the time when the request signal is transmitted.
  • the position data handed over to the motor controller 132 at the time of reception of the request signal is generally obtained before reception of the request signal.
  • a position detection apparatus in which the position data related to the transmission time is calculated (presumed) from the position data derived from the measurement value is known. In this apparatus the position data is transmitted before reception of the next request signal.
  • the CPU 125 in the position detection apparatus 110 clears the timer 126 to be 0, every time it is detects that the request signal is received, as shown in Fig. 11 (A) and (B). Then, the CPU 125 starts processing for obtaining the position data, when the value of the timer 126 becomes TM SET .
  • TM SET is data given to the CPU 125 beforehand.
  • the CPU 125 starts processing for obtaining the position data at time t c after time TM SET has passed since time t b .
  • the CPU 125 then performs calculation expressed with the following expression (hereinafter, referred to as correction expression), in order to obtain transmission position data SD 0 which is position data to be informed to the motor controller 132 as a response to the request signal to be received thereafter.
  • SD 0 DT 0 + (SD -1 - SD -2 ) ⁇ (TM RQ - TM SET ) / TM RQ
  • SD -1 and SD -2 are respectively transmission position data calculated (transmitted) last time and the last but one.
  • TM RQ is data given to the CPU 125 beforehand, as a period of the request signal output from the motor controller 132 connected to the position detection apparatus 110.
  • the CPU 125 then supplies the calculated SD 0 to the serial signal transmission circuit 120 via the serial signal conversion circuit 119, when the request signal is received in a later stage, and as a result, the position signal holding SD 0 is transmitted on the serial transmission line 131 (see Fig. 11 (E)).
  • the time t c when the hold command is issued is a time after time TM SET has passed since the reception time t b of the request signal, and the time when the next request signal is to be received should be time t d after time TM RQ has passed since the time t b .
  • V is equal to the change rate of the position of the scale disc 113 between time t a and t b (that is, (SD -1 - SD -2 ) / TM RQ )
  • SD 0 is calculated from the correction expression.
  • the conventional position detection apparatus 110 operates as described above, if the period of the request signal from the motor controller 132 exactly coincides with TM RQ , when the request signal is received, the position data representing the position of the scale disc 113 at that time can be informed to the motor controller.
  • the position detection apparatus 110 cannot inform the motor controller of the position data representing the position of the scale disc 113 at that time. Because, the transmission position data calculated by the CPU 125 is the position data representing the position of the scale disc 113 at the time when time TM RQ has passed since reception of the last request signal, and is not data at the time when time I RQ has passed.
  • the conventional position detection apparatus 110 cannot be used in combination with other motor controllers having different request signal periods, or cannot be used in combination with motor controllers which change the request signal period by itself.
  • the transmission timing of the request signal is controlled by hardware and software. That is to say, transmission of request signals, once in several times, is performed in the manner synchronized with the signal having exact period output from the hardware, and transmission of other request signals is in many cases timing-controlled by the software.
  • the position detection apparatus 110 is connected to such a motor controller, the interval of the request signal input to the position detection apparatus 110 varies.
  • the conventional position detection apparatus 110 outputs erroneous transmission position data, hence there may be a case where control of the motor is not performed properly.
  • position data having high precision (having many number of bits) can be supplied to the motor controller in a short period.
  • position data having high precision having many number of bits
  • the position of the magnetic pole of a permanent magnet used for the field magnet changes at high speed during high-speed rotation, hence it is required that the position of the magnetic pole can be informed to the motor controller in a short period.
  • the period in which the position data can be supplied to the motor controller 132 is limited by the transmission time of the position signal determined by the number of bits of the transmission position data, or by the time required for calculation of the transmission position data. As a result, there may be a case where the position detection apparatus cannot properly perform control of the motor or the like.
  • the position detection apparatus 110 is an apparatus which transmits signals of 7 frames in total, as shown in Fig. 12, comprising a control signal (CD) 801, 4-byte transmission position data signals (SD 0 ) 902, an alarm signal (ALM) 903, and a cyclic redundancy check signal (CRC) 904, as position signals, to the motor controller 132.
  • a control signal CD
  • SD 0 4-byte transmission position data signals
  • ALM alarm signal
  • CRC cyclic redundancy check signal
  • the position detection apparatus 110 cannot inform the motor controller 132 of the position data in a period shorter than this time. If the data transfer speed of the serial communication is increased, the period can be shortened, but since the signal becomes dull on the serial transmission line, it is actually impossible to increase the transfer speed than the current speed.
  • the time required for calculation of the transmission position data is a time in the same order as that required for transmission of the position signal, as shown schematically in Fig. 11.
  • the position detection apparatus comprises a detection unit which detects reception of a request signal which requests output of the position data; a sensor output measurement unit which measures the output of a sensor for detecting the position of an object to be measured, when a predetermined time has passed since reception of the request signal was detected by the detection unit; a position data calculation unit which calculates the position data representing the position of the object at a point of time when the measurement was performed, based on the output measured by the sensor output measurement unit; a corrected position data calculation unit which calculates corrected position data which is position data representing the position of the object at the time of receiving the request signal, using a value obtained by subtracting the predetermined time from the reception interval of the request signal, position data calculated by the position data calculation unit, and a presumed speed of the object; and an output unit which outputs the corrected position data calculated by the corrected position data calculation unit as a response to the request signal.
  • the position detection apparatus when the position data (corrected position data) at the time of reception of the request signal is calculated (presumed), based on the position data related to a certain time calculated based on the output of the sensor, the elapsed time from that time till the request signal has been actually received is used. Accordingly, even if the reception period of the request signal changes, the position detection apparatus can output accurate position data, and if this position detection apparatus is used, accurate position data related to the object can be obtained in a desired frequency. As a result, with this position detection apparatus, an apparatus to be controlled (e.g. a motor) which changes the position of the object can be controlled more appropriately.
  • an apparatus to be controlled e.g. a motor
  • the position detection apparatus comprises a detection unit which detects reception of a request signal for requesting output of the position data; a measurement processing execution unit which executes measurement of the sensor output for detecting a position of an object to be measured, every time multiples of time of an output period given in advance, being a period of an integral fraction of a period of the request signal, has passed, after a predetermined time has passed since the detection of the request signal, every time the reception of the request signal is detected by the detection unit; a position data calculation unit which calculates position data representing the position of the object at a point of time when measurement is performed, using a measured output, every time the output of the sensor is measured by the measurement processing execution unit; a corrected position data calculation unit which calculates the corrected position data, being position data representing the position of the object at a point of time first reached after measurement of the output by the sensor output measurement unit, which is a point of time when multiples of time of the output period has passed since the reception of the request signal, using a calculated position data, every
  • the position detection apparatus may be added with a monitoring unit which monitors the change rate of a position of the object and an output period change unit which changes a value of the output period to other values which are an integral fraction of a period of the request signal, depending on the monitoring result of the monitoring unit.
  • a bit length change unit which changes the bit length of the position data calculated by the position data calculation unit depending on the monitoring result of the monitoring unit may be also added.
  • the position detection apparatus By using the position detection apparatus according to the present invention, added with the monitoring unit or the like, it becomes possible to perform control of an apparatus to be controlled which is changing the position of the object in an environment depending on the change rate of the position of the object, thereby enabling appropriate control of the apparatus to be controlled.
  • the position detection apparatus may be added with an output period change unit which changes a value of the output period to other values which are an integral fraction of a period of the request signal, depending on the assignment information included in the request signal detected by the detection unit.
  • the position detection apparatus may be constructed such that the value of the output period is changed in response to the instruction from the equipment to be connected.
  • the position detection apparatus comprises a detection discrimination unit which detects reception of a request signal for requesting an output of the position data, and discriminating whether the request signal whose reception has been detected is a first class request signal or a second class request signal; a measurement processing execution unit which executes processing for measuring the output of a sensor for detecting the position of the object, every time multiples of time of a period of the request signal given in advance has passed, after a predetermined time has passed since the reception detection of the first class request signal, every time the reception of the first class request signal is detected by the detection discrimination unit; a position data calculation unit which calculates position data representing the position of the object at a point of time when measurement is performed, using a measured output, every time the output of the sensor is measured by the measurement processing execution unit; a corrected position data calculation unit which calculates the corrected position data, being position data representing the position of the object at a point of time first reached after measurement of the output by the sensor output measurement unit, which is a point of time when multiples of
  • the first class request signal is used as a signal for deciding the timing for starting a processing for obtaining the corrected position data, and a signal for deciding the timing for executing the data output (transmission).
  • the second class request signal is used only as a signal for deciding the timing for performing data output, and the start timing of the processing for obtaining the corrected position data output at the time of data output is decided based on the reception time of the first request signal.
  • the position detection apparatus is combined with another equipment (e.g. motor controller) which outputs the first request signal at the time of outputting the request signal controlled by the hardware control and outputs the second request signal at the time of outputting the request signal controlled by the software control, even if the transmission timing of the request signal varies in the equipment, control itself of the apparatus to be controlled (e.g. motor) which is changing the position of the object can be performed without any problem.
  • another equipment e.g. motor controller
  • the position detection apparatus may be added with a transmission unit which transmits a signal having a first predetermined number of bits representing corrected position data, on a serial transmission line to which the equipment for outputting the request signal is connected, as a detection result, with regard to the corrected position data first output by the corrected position data output unit, and a signal having a second predetermined number of bits, which is smaller than the first predetermined number of bits, representing a difference between the corrected position data and corrected position data output last time, on the serial transmission line, as a detection result, with regard to the corrected position data output for the second time and after by the corrected position data output unit.
  • the position detection apparatus added with this transmission unit is combined with an apparatus which stores the corrected position data represented by the first input signal as the absolute position data, adds data represented by the signal input after that to the absolute position data, and handles the absolute position data after the addition as data representing the position of an object at that point of time, and also controls the object directly or indirectly (e.g. motor controller), the time required for transmission of the corrected position data can be further shortened. That is to say, the acquisition frequency of the corrected position data can be increased, and as a result, the apparatus to be controlled (e.g. motor) can be controlled more appropriately.
  • the apparatus to be controlled e.g. motor
  • Fig. 1 is a diagram showing a construction of a position detection apparatus according to a first embodiment of the present invention
  • Fig. 2 is a flow chart showing the operation procedure of a CPU in the position detection apparatus according to the first embodiment
  • Fig. 3 is a timing chart for explaining the operation of the position detection apparatus according to the first embodiment
  • Fig. 4 is a flow chart showing the operation procedure of a CPU in a position detection apparatus according to a second embodiment of the present invention
  • Fig. 5 is a timing chart for explaining the operation of the position detection apparatus according to the second embodiment
  • Fig. 6 is a flow chart showing the operation procedure of a CPU in a position detection apparatus according to a third embodiment of the present invention
  • Fig. 1 is a diagram showing a construction of a position detection apparatus according to a first embodiment of the present invention
  • Fig. 2 is a flow chart showing the operation procedure of a CPU in the position detection apparatus according to the first embodiment
  • Fig. 3 is a timing chart for explaining the operation of the position
  • Fig. 7 is a timing chart for explaining the operation of the position detection apparatus according to the third embodiment
  • Fig. 8 is a flow chart showing the operation procedure of a CPU in a position detection apparatus according to a fourth embodiment of the present invention
  • Fig. 9 is a diagram showing the operation of a position detection apparatus according to a fifth embodiment
  • Fig. 10 is a diagram showing a construction of a position detection apparatus in the prior art
  • Fig. 11 is a timing chart for explaining the operation of the position detection apparatus in the prior art
  • Fig. 12 is a diagram showing a signal transmitted to a motor controller from the conventional position detection apparatus.
  • FIG. 1 A schematic construction of a position detection apparatus according to the first embodiment of the present invention is shown in Fig. 1.
  • the position detection apparatus 10 is a so-called optical rotary encoder, and comprises a light-emitting circuit 11, a photo-detecting circuit 12, a scale disc 13 and an amplifier 14.
  • the position detection apparatus 10 also comprises a sample holding section 15, a multiplexer 16, an A/D converter 17, a microcomputer 18, a serial signal conversion circuit 19, and a serial signal transmission circuit 20.
  • the position detection apparatus 10 comprises a circuit (not shown) which detects one revolution of the scale disc based on the output of a specific photodetector 22, and a multi-turn counter (not shown) which is a counter for counting up every time it is detected that the scale disc 13 makes one turn. This counter is connected to the CPU 25.
  • the position detection apparatus 10 is connected to a motor controller 32 using a serial transmission line 31 and used.
  • Sections other than the microcomputer 18 of the position detection apparatus 10 perform the same operation as those having the same name in the position detection apparatus 110. Hence, the operation of the position detection apparatus 10 will be described below, mainly for the control operation by the microcomputer 18 (CPU 25), with reference to Fig. 2 and Fig. 3.
  • Fig. 2 is a flow chart showing the sequence of operation of the microcomputer 18 (CPU 25).
  • Fig. 3 (A) illustrates a timing for the position detection apparatus 10 to receive a request signal from the motor controller 32, (B) illustrates the time change in a value of a timer 26 in the microcomputer 18.
  • (C) illustrates the timing that the sample holding signal is output from the microcomputer 18 to the sample holding section 15, and (D) rates the time change in the contents of processing executed by the CPU 25. Finally, (E) illustrates the timing when a position signal holding the transmission position data is transmitted from the position detection apparatus 10.
  • step S110 the processing executed by the CPU 25 is largely divided into a first branching processing (step S110) which is initiated when the value of the timer 26 becomes a predetermined value TM SET , a second branching processing (step S120) which is initiated when the request signal is received and other software processing (step S130) which is a processing performed when each branching processing is not performed.
  • the CPU 25 suspends other active software processing, and designates the sample holding signal as "L", to thereby have the sample holding section 15 hold M signals from the amplifier 14 (step S111). That is to say, the CPU 25 fixes the signal input to the multiplexer 16 to a signal representing the condition of the scale disc 13 when the value of the timer 26 becomes TM SET .
  • the CPU 25 supplies a predetermined selection signal to the multiplexer 16 so that one of M signals input to the multiplexer 16 is supplied to the A/D converter 17 (step S112). Then, the CPU 25 operates the A/D converter 17, and as a result, the data output from the A/D converter 17 is stored (step S113). Thereafter, if there remain signals which have not been subjected to the processing in steps S112 and S113 (step S114: No) in signals output by the multiplexer 16, the CPU 25 returns the process to step S112, to perform processing for unprocessed signals.
  • step S114 When acquisition of the A/D conversion results of all (M) signals output by the multiplexer 16 has been completed (step S114: Yes), the CPU 25 returns the sample holding signal to the level "H" (step S115). Further, the CPU 25 calculates position data DT 0 at the time when the value of the timer 26 is TM SET , from the obtained M data and the value of the multi-turn counter, and stores the data (step S116). Then, the CPU 25 completes the first branching processing, and starts other software processing.
  • the CPU 25 starts the first branching processing at time t c (t b + TM SET ). That is to say, as schematically shown in Figs. 3 (C) and (D), the CPU 25 designates the sample holding signal as "L” at time t c , as well as starting control of the multiplexer 16 and the A/D converter 17 to thereby obtain M data. The CPU 25 then returns the sample holding signal to the level "H", and calculates the position data DT 0 at time t c . Then, the CPU 25 completes the first branching processing and starts other processing.
  • the CPU 25 When reception of the request signal is detected, the CPU 25 starts the second branching processing (step S120), reads the value of the timer 26 at that point of time, and stores the value as TM 0 (step S121). The CPU 25 then clears the timer 26 to be 0 (step S122).
  • the CPU 25 calculates the correction amount which is a value that the transmission position data SD 0 can be obtained by adding it to the position data DT 0 (step S123).
  • the transmission position data SD 0 to be transmitted as a response to the request signal received at time t d is data that can be obtained by adding the variation of the position between time t c and t d to the position data DT 0 .
  • V (SD -1 - SD -2 ) / TM -1 can be set up, and after all, DTD can be calculated from TM 0 , TM SET , SD -1 , SD -2 and TM -1 by the above-described expression.
  • the CPU 25 After calculation of the correction amount DTD, the CPU 25 adds the calculated DTD to the position data DT 0 calculated at the time of the first branching processing to prepare the transmission position data SD 0 (step S124). In this step, the CPU 25 also executes the processing for designating the data heretofore stored as transmission position data SD -1 and transmission position data SD 0 , as transmission position data SD -2 and transmission position data SD -1 , respectively.
  • the CPU 25 then supplies the prepared transmission position data SD 0 to the serial signal conversion circuit 19, to thereby transmit a position signal in a conventional format holding the transmission position data SD 0 (see Fig. 12) to the serial signal transmission circuit 20 (step S125), and hence completes the second branching processing.
  • the position detection apparatus 10 As described above, with the position detection apparatus 10 according to the first embodiment, the reception interval (TM 0 ) of the request signal is measured, and the transmission position data SD 0 is calculated from the position data DT 0 , using the measured reception interval. Accordingly, even if the position detection apparatus 10 is connected to other motor controllers having different request signal period, the position detection apparatus 10 can output accurate position data. In other words, the position detection apparatus 10 according to this invention can output the exact position of the slit disc 13 at a required frequency (provided that there is an upper limit in the frequency). As a result, use of the position detection apparatus 10 enables more appropriate control of the motor which changes the position (angle of rotation) of the slit disc 13.
  • the position detection apparatus 10 is constructed so as to calculate DTD, using (SD -1 - SD -2 ) / TM -1 as the change rate V. However, instead of (SD -1 - SD -2 ) / TM -1 , (DT 0 - DT -1 ) / TM -1 (DT -1 is position data calculated in the last first branching processing) or (DT 0 - SD -1 ) / TM SET may be used.
  • Fig. 1 is used as a figure showing the construction thereof.
  • the position detection apparatus is connected for use to a motor controller 32 which transmits the request signal in a period I RQ , and which can receive the position data even when the request signal is not transmitted.
  • the CPU 25 in the position detection apparatus is provided with TM SET and TM LMT (>TM SET ) whose value coincides with I RQ /N (N is an integer equal to or larger than 2), before starting to use the position detection apparatus.
  • the CPU 25 executes any one of the first branching processing (step S210), the second branching processing (step S220) and other software processing (step S230), as shown in Fig. 4.
  • the CPU 25 suspends other software processing (step S230) that has been active, and executes the first branching processing (step S210). Moreover, when the request signal from the motor controller 32 is received, and when the value of the timer 26 becomes TM LMT , the CPU 25 executes the second branching processing.
  • the CPU 25 first designates the sample holding signal as "L”, to thereby have a sample holding section 15 hold M signals from an amplifier 14 (step S211). That is to say, the CPU 25 fixes the signal input to a multiplexer 16 to a signal representing the condition of a scale disc 13 when the value of the timer 26 becomes TM SET .
  • step S212 the CPU 25 supplies a predetermined selection signal to the multiplexer 16 so that one of M signals input to the multiplexer 16 is supplied to an A/D converter 17 (step S212). Then, the CPU 25 operates the A/D converter 17, and as a result, the data output from the A/D converter 17 is stored (step S213). If there remain signals which have not been subjected to the processing in steps S212 and 313 (step S214: No), the process returns to step S212, to perform processing for unprocessed signals.
  • step S214 When processing with respect to the whole (M) signals has been completed (step S214: Yes), the CPU 25 returns the sample holding signal to the level "H" (step S215), and calculates position data DT 0 when the value of the timer 26 is TM SET from the obtained M data (step S216).
  • the CPU 25 adds the calculated DTD to the position data DT 0 to prepare the transmission position data SD 0 this time (step S228).
  • the CPU 25 then completes the first branching processing and starts the other software processing (step S230).
  • the CPU 25 starts the second branching processing (step S220), and first clears the timer 26 to be 0 (step S221).
  • step S222: Yes the CPU designates the periodic number as "0" (step S223).
  • step S222: No the CPU increments the periodic number by "1" (step S224).
  • the CPU 25 when detecting reception of the request signal (at the time of the second branching processing), the CPU 25 clears the timer 26 to be 0. Then, the CPU 25 starts the first branching processing when the value of the timer 26 becomes TM SET .
  • the CPU 25 designates the sample holding signal as "L”, as well as performing control of the multiplexer 16, the A/D converter 17 or the like, to thereby obtain M data.
  • the CPU 25 then returns the sample holding signal to the level "H” , and calculates the position data DT 0 representing the position at time t b from the obtained M data.
  • the CPU 25 determines the estimated value of the variation of the position from time t b to time t c (that is, correction amount DTD), and adds the estimated value to the position data DT, to thereby obtain transmission position data SD 0 representing the position of the slit disc 113 at time t c .
  • the CPU 25 increments the periodic number by "1", after having cleared the timer 26 to 0.
  • the periodic number becomes "1" which shows that the transmission position data is the first data not depending on the reception of the request signal, and the CPU 25 prepares the transmission data including the periodic number and the transmission position data.
  • the CPU 25 transmits a position signal holding the transmission data by means of the serial signal transmission circuit 20.
  • the motor controller can recognize that the transmitted position data is data obtained at which time, from the periodic number included in the received position signal.
  • the CPU 25 clears the timer 26 to 0 and designates the periodic number as "0". Then, the CPU 25 prepares the transmission data including the periodic number showing that the transmission position data is data depending on the reception of the request signal, and supplies the transmission data to the serial signal conversion circuit 19, to thereby transmit a position signal according to the transmission data by means of the serial signal transmission circuit 20.
  • the position detection apparatus performs calculation and transmission of the position data at a period TM SET given in advance, which is synchronized with a reception period of the request signal. Therefore, if the position detection apparatus according to the second embodiment is combined with a motor controller which transmits only a request signal having accurate period time-controlled by the hardware, adverse effect on the motor control due to a difference in the transmission (reception) interval of the request signal can be minimized.
  • the position detection apparatus transmits a position signal including a periodic number showing which period the position data is in since the reception of the request signal. This is for not increasing the processing load on the motor controller side, hence it is also possible to construct the position detection apparatus so as to transmit a signal without having a periodic signal.
  • the hardware construction of the position detection apparatus according to the third embodiment of the present invention is the same as that of the position detection apparatus 10 according to the first embodiment.
  • the CPU 25 in the position detection apparatus is programmed so as to operate differently from the CPU 25 in the position detection apparatus according to the first embodiment.
  • the CPU 25 is provided with TM SET and TM LMT (>TM SET ) whose value coincides with the request signal period, before starting to use the position detection apparatus.
  • TM SET and TH LMT are also supplied to a timer 26, and when the value thereof becomes TM SET , the timer 26 informs the CPU 25 of the matter, and when the value thereof becomes TM LMT , the timer 26 clears itself to be 0.
  • the position detection apparatus is connected for use to a motor controller 32 which transmits a request signal including the information named as "request discrimination bit".
  • the request discrimination bit is information showing whether the request signal is a request signal or not having an exact period time-controlled by the hardware in the motor controller.
  • a request signal having an exact period is marked as RQ 0
  • other request signals are marked as RQ 1 .
  • the CPU 25 in the position detection apparatus according to the third embodiment suspends other active software processing, when the value of the timer 26 becomes TM SET , as shown in Fig. 6, and executes the first branching processing (step S310, steps S311 to S318).
  • the first branching processing is identical with the first branching processing executed by the CPU in the position detection apparatus according to the second embodiment, which has been described using Fig. 4, and hence the description thereof is omitted.
  • the CPU 25 starts the second branching processing (step S320), and first judges if the request signal is the request signal RQ 0 having the exact period, or the request signal RQ 1 of a period not necessarily being exact period, based on the request discrimination bit included in the received request signal (step S321).
  • step S321: Yes If the received request signal is the request signal RQ 0 (step S321: Yes), the CPU 25 clears the timer 26 to be 0 (step S322), and then transmits the position signal (step S323), to thereby complete the second branching processing. On the other hand, if the received request signal is not the request signal RQ 0 (step S321: No), the CPU 25 transmits the position signal without clearing the timer 26 to be 0 (step S323), and completes the second branching processing.
  • FIG. 7 A case in which the motor controller 32 outputs alternately the request signal RQ 0 and the request signal RQ 1 is taken as an example.
  • (A) illustrates a timing for the position detection apparatus 10 to receive a request signal from the motor controller 32
  • (B) illustrates the time change in a value of the timer 26 in a microcomputer 18.
  • (C) illustrates the timing that a sample holding signal is output from the microcomputer 18 to a sample holding section 15, and
  • D illustrates the time change in the contents of processing executed by the CPU 25.
  • E illustrates the timing when a position signal is transmitted from the position detection apparatus 10.
  • the request signal RQ 0 is used as a signal for deciding a timing for starting the processing for obtaining the position data, and as a signal for deciding a timing for executing the data transmission to the motor controller.
  • the request signal RQ 1 is used only as a signal for deciding timing for executing the data transmission to the motor controller, and the start timing of the processing for obtaining the position data transmitted at the time of data transmission is decided on the basis of the reception time of the request signal RQ 0 .
  • this position detection apparatus is combined with a motor controller which adds a request discrimination bit showing that it is a signal of an exact period to a request signal having an exact period controlled by the hardware, and adds a request discrimination bit showing that it is a signal of not necessarily an exact period to a request signal controlled by the software, even if there is a change in the transmission timing of the request signal controlled by the software, control of the motor itself can be performed precisely.
  • a motor controller can be realized by a slight modification to a conventional motor controller.
  • the position detection apparatus according to the fourth embodiment is the one obtained by modifying the position detection apparatus according to the first embodiment, hence, only a portion where the operation thereof is different from the first embodiment will be described here.
  • the position detection apparatus transmits a position signal comprising 7 frames, every time it receives a request signal, in the same manner as the conventional position detection apparatus.
  • the position detection apparatus according to the fourth embodiment transmits a position signal comprising 7 frames at the time of the first communication with the motor controller, and transmits a position signal comprising 5 frames at the time of later communication.
  • the signal transmitted by the position detection apparatus starts with CD, as with the signal transmitted by the conventional position detection apparatus (see Fig. 12) and ends with ALM and CRC.
  • the position detection apparatus uses as CD the one in which a portion that is not utilized as a communication error protection signal is utilized as a discrimination signal, as shown in Fig. 8 (B).
  • the CPU 25 in the position detection apparatus controls each section (mainly, a serial signal conversion circuit 19) such that a signal of 7 frames comprising CD, SD 0 , ALM and CRC (hereinafter, referred to as "initial communication signal") is transmitted, in the same manner as that of the conventional position detection apparatus.
  • the CPU 25 controls such that CD 801 0 including a discrimination signal 807 showing that the own signal is the initial communication signal is transmitted as CD.
  • the CPU 25 controls each section such that a signal is transmitted which includes, instead of SD 0 , byte data representing a difference between the transmission position data SD -1 last time and the transmission position data SD 0 this time, "SD 0 - SD -1 ", and one of four byte data constituting SD 0 , which is a signal including CD 801 in which the discrimination signal 807 showing which is included of the four bytes constituting SD 0 is set.
  • the CPU 25 controls such that a signal is transmitted which includes the difference between the transmission position data SD -1 last time and the transmission position data SD 0 this time, "SD 0 -SD -1 ", SD 0 LL 803, being the first byte of the transmission position data SD 0 this time, and CD 801 1 showing that SD 0 LL is included.
  • the CPU 25 controls such that a signal is transmitted which includes the difference between the transmission position data SD -1 last time and the transmission position data SD 0 this time, "SD 0 - SD -1 ", SD 0 LH 804, being the second byte of the transmission position data SD 0 this time, and CD 801 2 showing that SD 0 LH is included.
  • the CPU 25 controls such that a signal including "SD 0 - SD -1 ", SD 0 HL 805, being the third byte of the transmission position data SD 0 , and CD 801 3 showing that SD 0 HL is included is transmitted.
  • the CPU 25 controls such that a signal including "SD 0 -SD -1 ".
  • SD 0 HH 806, being the fourth byte of the transmission position data SD 0 , and CD 801 4 showing that SD 0 HH is included is transmitted.
  • the CPU 25 controls each section such that a signal including SD 0 LL is transmitted.
  • the CPU 25 in the position detection apparatus controls each section such that a signal of 7 frames comprising 4 byte SD 0 is transmitted, at the time of the first time transmission of the transmission position data. Also, the CPU 25 controls each section such that at the time of transmission of the transmission position data for the time of "4 x I - 2" (I is a natural number), a signal including SD 0 LL is transmitted, and at the time of transmission of the transmission position data for the time of "4 ⁇ I - 1", a signal including SD 0 LH is transmitted. Moreover, the CPU 25 controls each section such that at the time of transmission of the transmission position data for the time of "4 ⁇ I + 1", a signal including SD 0 HH is transmitted.
  • this position detection apparatus is combined with a motor controller 32 which stores the transmission position data informed in the initial communication signal as absolute position data, and thereafter, every time the position signal is informed from the position detection apparatus, the difference data included in the position signal is added to the absolute position data, and handles the absolute position data after calculation as data representing the position of the slit disc 13 (and a motor connected thereto) at that point of time, a system operating with a request signal period shorter than before can be obtained, in other words, information for control of motor or the like can be obtained more frequently. As a result, a system in which control of motor or the like can be performed more appropriately can be constructed.
  • the position detection apparatus is the one obtained by modifying the position detection apparatus according to the second embodiment, and is connected for use to a motor controller 32 which transmits the request signal in a period I RQ , and which can receive the position data even when the request signal is not transmitted.
  • the CPU 25 in the position detection apparatus is provided with TM SET , TM LMT (>TM SET ) whose value coincides with the request signal transmission period I RQ , and a threshold value V t of the position change rate, before starting to use the position detection apparatus.
  • FIG. 9 illustrates a timing for the position detection apparatus 10 to receive a request signal from the motor controller 32
  • (B) illustrates a time change in the position change rate "(SD 0 - SD -1 )/TM LMT ".
  • (C) illustrates the time change in a value of the timer 26 in the microcomputer 18, and
  • (D) illustrates the time change in the contents of processing executed by the CPU 25.
  • (E) illustrates the timing when a position signal is transmitted from the position detection apparatus.
  • the position detection apparatus has two operation modes. That is, a normal mode and a high-speed mode.
  • the normal mode is an operation mode selected when the position change rate specified by (SD 0 -SD -1 )/TM LMT is V t or lower.
  • the high-speed mode is an operation mode selected when the position change rate exceeds V t .
  • the CPU 25 in the fifth embodiment operates similarly to the CPU 125 in the conventional position detection apparatus 110, except that the CPU 25 judges if the position change rate exceeds V t or not.
  • the CPU 25 clears a timer 26 to be 0, and controls a serial signal conversion circuit 19 or the like such that a position signal including the already calculated transmission position data is transmitted on a serial transmission line 31.
  • the CPU 25 executes processing starting with the supply of the sample holding signal at level "L" to a sample holding section 15, to thereby calculate the transmission position data.
  • the CPU 25 controls the serial signal conversion circuit 19 or the like such that a position signal including the transmission position data is transmitted on the serial transmission line 31.
  • the CPU 25 While executing such processing, the CPU 25 also judges if the position change rate "(SD 0 - SD -1 )/TM LMT " calculated from the transmission position data SD 0 calculated this time and the transmission position data SD -1 calculated last time is V t or lower.
  • this judgement is performed at the time of completion of the position data calculation processing, as schematically shown by a circle in Fig. 9 (B). Then, at the time of reception of the request signal, control corresponding to the judgement result is performed.
  • the CPU 25 starts processing for calculating the transmission position data, when the value of the timer 26 coincides with the TM SET after the change, and performs control for transmitting a signal including the transmission position data obtained by the processing, when the value of the timer 26 coincides with the TM LMT (please see after the time t c in Fig. 12).
  • the CPU 25 calculates the data for angle of rotation of M" bits from M measurement data, in this high-speed mode.
  • M" is a number of bits less than the number of bits M' of the data for angle of rotation calculated in the normal mode, and set in advance so that the position data can be calculated twice and the position signal including the position data can be transmitted twice during the request signal period I RQ .
  • the CPU 25 judges whether or not the position change rate is V t or lower, and under a condition that it is judged that the position change rate is V t or lower, when the request signal is received, the CPU 25 changes the operation mode to the normal mode. That is to say, the CPU 25 clears the timer 26 to be 0, and doubles the value of TM LMT and TM SET (returns the value to the initial value), respectively.
  • the CPU 25 controls each section such that a signal including attribute information 1005 comprising information showing the operation mode is in the normal mode or the high-speed mode and a periodic number together with the transmission position data can be transmitted as a position signal, and the motor controller 32 interprets the position data included in the received position signal based on the attribute information.
  • the position detection apparatus automatically changes the transmission period or the like of the position data, depending on the position change rate of the slit disc 13.
  • the motor controller combined with this position detection apparatus can recognize the position of the magnetic pole of a permanent magnet in the synchronous motor in a short period, though a rough precision, and when the synchronous motor is operated at a normal speed, the motor controller can recognize the position of the magnetic pole of the permanent magnet in the synchronous motor at high precision and in a suitable period.
  • this position detection apparatus enables efficient control of the motor. It is mentioned above that the position detection apparatus according to the fifth einbodiment makes TM LMT or the like 1/2.
  • TM LMT or the like may be made 1/K (where K is an integer equal to or greater than 3).
  • the position detection apparatus according to the fifth embodiment has two operation modes.
  • this apparatus may be provided with two or more thresholds related to the position change rate, and has three or more operation modes.
  • the position detection apparatus is an apparatus which changes the operation mode depending on the measured (calculated) position change rate, but it may be such that a motor controller is for transmitting a request signal including information specifying the precision of required position data and the transmission period, and the position detection apparatus is an apparatus for outputting the position data at a precision and at a transmission period according to the information included in the request signal.
  • the position detection apparatus in each embodiment may be modified in the manner other than being described above.
  • the position detection apparatus in the second, third and fifth embodiments it is possible to construct a position detection apparatus in which a transmission procedure used in the position detection apparatus according to the fourth embodiment is used as the transmission procedure of the position signal.
  • a position detection apparatus in which a position signal is transmitted to control equipment such as a motor controller by a parallel transmission line.
  • the position detection apparatus in each embodiment is a so-called rotary encoder, but it is a matter of courts that a technique shown in each embodiment may be applied to an apparatus which detects other than the angle of rotation.
  • the position detection apparatus is useful as an output source of position data required for controlling equipment such as synchronous motor which moves an object to be measured, and in particular, is suitable to be used for supplying the position data to the equipment in which high-speed control is desired.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Control Of Position Or Direction (AREA)
EP98941684A 1998-09-02 1998-09-02 Detecteur de position Withdrawn EP1116936A4 (fr)

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PCT/JP1998/003934 WO2000014483A1 (fr) 1998-09-02 1998-09-02 Detecteur de position

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EP1116936A1 true EP1116936A1 (fr) 2001-07-18
EP1116936A4 EP1116936A4 (fr) 2003-06-25

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CN1309760A (zh) 2001-08-22
WO2000014483A1 (fr) 2000-03-16
US20010001540A1 (en) 2001-05-24
HK1039517A1 (zh) 2002-04-26
US6348695B2 (en) 2002-02-19
JP3538145B2 (ja) 2004-06-14
EP1116936A4 (fr) 2003-06-25

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